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Temporal range: Late Cretaceous, 70–66 Ma
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Squamata
Superfamily: Mosasauroidea
Family: Mosasauridae
Genus: Plesiotylosaurus
Camp, 1942
Species: P. crassidens
Binomial name
Plesiotylosaurus crassidens
Camp, 1942

Plesiotylosaurus is a genus of mosasaur from the Maastrichtian stage of the Late Cretaceous of North America.


  • Dinosaurs and Other Mesozoic Reptiles of California by Richard P. Hilton, Kevin Padian, and Ken Kirkland (page 30)
  • Ancient Marine Reptiles by Jack M. Callaway and Elizabeth L. Nicholls (page 286)
  • The Osteology of the Reptiles by Alfred Sherwood Romer (page 562)